Daughter of Gomez Addams and Morticia Addams, and generally the older sister to Pugsley Addams. In earlier continuities, she was somewhat cruel (especially to Puglsey), but mostly a cheerful and sweet little girl, but around the time of the 1990s film continuity her personality was canonized as a dour, cynical goth.
This Wednesday has since become an icon for the goth community, and is the version that influenced the later Wednesday characterization of her.